Looks like you didn't run cmd_archiver -C <config_file> -I
Ahh, okay, that did something, which I think means it created a directory named after the slave IP in the archive directory. I didn't see any mention of that switch in the README file, unless it's mentioned elsewhere and I missed it.
Now when I run "./cmd_archiver -C cmd_archiver.ini" I get:
rsync: link_stat "/var/lib/postgresql/pitr_tools/None" failed: No such file or directory (2)
rsync error: some files could not be transferred (code 23) at main.c(1058) [sender=3.0.3]
rsync: link_stat "/var/lib/postgresql/pitr_tools/None" failed: No such file or directory (2)
rsync error: some files could not be transferred (code 23) at main.c(1058) [sender=3.0.3]
FATAL: Unabled to rsync_transfer or queue_transfer
CRITICAL 5888